.\"	$OpenBSD: toupper.3,v 1.15 2013/06/05 03:39:22 tedu Exp $
.\"
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.\" the American National Standards Committee X3, on Information
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.Dd $Mdocdate: June 5 2013 $
.Dt TOUPPER 3
.Os
.Sh NAME
.Nm toupper ,
.Nm _toupper
.Nd lower case to upper case letter conversion
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn toupper "int c"
.Ft int
.Fn _toupper "int c"
.Sh DESCRIPTION
The
.Fn toupper
function converts a lower-case letter to the corresponding
upper-case letter.
The
.Fn _toupper
function is identical to
.Fn toupper
except that
.Ar c
must be a lower-case letter.
.Sh RETURN VALUES
If the argument to the
.Fn toupper
function is a lower-case letter, the corresponding upper-case letter
is returned if there is one; otherwise the argument is returned unchanged.
If the argument to the
.Fn _toupper
function is a lower-case letter, the corresponding upper-case letter
is returned; otherwise the output is undefined.
.\" In the
.\" .Em ``C''
.\" locale,
.\" .Fn toupper
.\" maps only the characters for which
.\" .Xr islower
.\" is true to the corresponding characters for which
.\" .Xr isupper
.\" is true.
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn toupper
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Nm
must be
.Dv EOF
or representable as an
.Li unsigned char ;
otherwise, the result is undefined.
